body{
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: url(/assets/images/group.jpg) no-repeat;
  background-size: cover;
}
.denglu{
  width: 400px;
  height: 310px;
  background-color: #fff;
  position:absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  padding:0px 30px;
}
.zhuce{
  width: 400px;
  height: 310px;
  background-color: #fff;
  position:absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  padding:0px 30px;
  display: none;
}
.titleon{
  width: 100%;
  height: 65px;
  background: url(/assets/images/login_title.png) no-repeat center;
}
#tree{
  font-size: 12px;
  display: flex;
  justify-content: flex-end
}
